66034-17-1

Basic information

• Product Name: DIPHOSPHORIC ACID COMPD. WITH-PIPERAZINE (1:1)
• Synonyms: DIPHOSPHORIC ACID COMPD. WITH-PIPERAZINE (1:1)
• CAS NO: 66034-17-1
• Molecular Formula: C₄H₁₀N₂*H₄O₇P₂
• Molecular Weight: 264.110682
• Mol File: 66034-17-1.mol
• Article Data: 5

Chemical Properties

• Appearance: /
• Density: 1.71 g/cm3
• Vapor Pressure: 0Pa at 49℃
• Water Solubility: 12.24g/L at 20℃
• CAS DataBase Reference: DIPHOSPHORIC ACID COMPD. WITH-PIPERAZINE (1:1)(CAS DataBase Reference)
• NIST Chemistry Reference: DIPHOSPHORIC ACID COMPD. WITH-PIPERAZINE (1:1)(66034-17-1)
• EPA Substance Registry System: DIPHOSPHORIC ACID COMPD. WITH-PIPERAZINE (1:1)(66034-17-1)

Safety Data

• Hazardous Substances Data: 66034-17-1(Hazardous Substances Data)

Usage

Flammability and Explosibility

Notclassified

Synthetic route

piperazine diphosphate (1951-97-9, 14538-56-8, 52978-33-3, 74592-75-9) → piperazine pyrophosphate (66034-17-1)

Conditions	Yield
With boron phosphate In iP2028 at 210 - 230℃; for 2h; Product distribution / selectivity;	98%
With boron phosphate at 210 - 230℃; for 2h; Temperature; Reagent/catalyst; Dean-Stark;	98%
With phosphoric acid In iP2028; water at 210 - 230℃; for 2h; Product distribution / selectivity; Dean-Stark trap;	97%

piperazine (110-85-0) → piperazine pyrophosphate (66034-17-1)

Conditions	Yield
With hydrogenchloride; sodium pyrophosphate In water at 10 - 20℃; for 3h; Product distribution / selectivity;	46%

piperazine diphosphate (1951-97-9, 14538-56-8, 52978-33-3, 74592-75-9) + 2,4,6-triamino-1,3,5-triazinium orthophosphate (20208-95-1) → melamine pyrophosphate + piperazine pyrophosphate (66034-17-1)

Conditions	Yield
at 230 - 270℃; Product distribution / selectivity;

piperazine hydrogen phosphate (14538-56-8) → piperazine pyrophosphate (66034-17-1)

Conditions	Yield
With phosphoric acid In 5,5-dimethyl-1,3-cyclohexadiene at 150 - 300℃;
With ammonium dihydrogen phosphate In paraffin oil at 210℃; for 1h; Temperature;

piperazine (110-85-0) + sodium pyrophosphate (124-43-6) → piperazine pyrophosphate (66034-17-1)

Conditions	Yield
With hydrogenchloride In water at 10 - 20℃; for 3h;	0.23 mol

Upstream product

• 110-85-0 piperazine 
• 124-43-6 sodium pyrophosphate 
• 14538-56-8 piperazine hydrogen phosphate 
• 1951-97-9 piperazine diphosphate 
• 20208-95-1 2,4,6-triamino-1,3,5-triazinium orthophosphate 

Relevant articles and documents

Thermal properties and combustion behaviors of flame-retarded glass fiber-reinforced polyamide 6 with piperazine pyrophosphate and aluminum hypophosphite

Flame-retardant glass fiber-reinforced PA6 (GFPA6) composites were prepared by incorporating the mixture of piperazine pyrophosphate (PAPP) and aluminum hypophosphite (AHP) into GFPA6. From the results of UL-94 test, limiting oxygen index (LOI) and microscale combustion calorimetry (MCC) tests, the as-obtained composites exhibited significantly enhanced flame retardancy including higher LOI values, better UL94 rating (V-0 for 18.0?mass% PAPP/AHP mixture), and decreased peak heat release rate and total heat release. And PA6-4 with a 4/1 mass ratio of PAPP to AHP reached the highest LOI value. The influence of PAPP/AHP on the decomposition pathway of GFPA6 was discussed based on TG and TG-FTIR analysis. The interaction between PAPP/AHP and GFPA6 altered the decomposition pathway of GFPA6 resulting in the formation of compact char layer, high thermal stability within high-temperature region, and weak intensities of a variety of pyrolysis gas products. Meanwhile, the thermomechanical property data revealed the storage modulus of samples were increased with increasing PAPP/AHP content, whereas the glass transition temperatures were reduced gradually. Moreover, the results of scanning electron microscope illustrated that the introduction of PAPP/AHP mixture can promote the formation of compact char layer and change the surface element composition of the char.

Preparation method of pyrophosphate piperazine

The invention discloses a preparation method of pyrophosphate piperazine. The preparation method comprises the following steps: mixing ammonium dihydrogen phosphate and piperazine in an aqueous solution according to a mole ratio of 2:1, heating to remove ammonia, and dewatering for condensation to obtain the pyrophosphate piperazine. According to the preparation method, the shortcomings that conventional liquid phosphoric acid serving as a phosphorous source is difficult to transport and store are overcome; a reaction system is a weak-alkaline environment, so that erosion of the phosphoric acid serving as the phosphorous source to equipment is avoided; ammonia released during reaction can be used as protection atmosphere of the reaction system, and the whiteness value of a product meets the market requirement. Compared with a phosphoric acid-piperazine method, the preparation method has the advantage of saving the raw material cost by 10 to 15 percent.

HIGH-PURITY PIPERAZINE PYROPHOSPHATE AND METHOD FOR PRODUCING SAME

The present invention provides piperazine pyrophosphate represented by chemical formula (I) which has a sodium content of 10 ppm or lower and a process of producing the same. The piperazine pyrophosphate has high purity and provides a flame retardant composition exhibiting excellent flame retardancy. The process includes dehydration condensation of piperazine diphosphate and is able to produce the piperazine pyrophosphate at low cost.